EP0282774B1 - Ultrasonic check valve inspection - Google Patents
Ultrasonic check valve inspection Download PDFInfo
- Publication number
- EP0282774B1 EP0282774B1 EP88102656A EP88102656A EP0282774B1 EP 0282774 B1 EP0282774 B1 EP 0282774B1 EP 88102656 A EP88102656 A EP 88102656A EP 88102656 A EP88102656 A EP 88102656A EP 0282774 B1 EP0282774 B1 EP 0282774B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- closure member
- path
- body portion
- transmitter
- receiver
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/24—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using infrasonic, sonic, or ultrasonic vibrations
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/001—Acoustic presence detection
Definitions
- the present invention pertains to valve inspection, and more particularly, to an in-line inspection technique that provides a simple, non-intrusive verification of check valve operability without valve disassembly.
- the present invention satisfies this need in accordance with a method in which one or more ultrasonic transducers are positioned on the valve body, to generate output traces that can confirm whether the closure member in the valve can be caused to move as expected.
- the invention includes the steps defined in independent claim 1 or independent claim 2.
- the invention is especially well-suited for verifying the range of motion of the closure member on check valves, which normally do not include position indicators.
- a swing-type check valve two transmitters and associated receivers are preferably used, oriented at right angles to each other. One is positioned next to the valve seat, transverse to the flow direction, and the other is positioned on the valve surface closest to the fully open position of the closure member, facing the valve seat.
- Figure 1 schematically illustrates a portion of a process 10 including a fluid line 12 in which are located a check valve 14, the operation of which is to be verified, a pump 16 and a control valve 18.
- FIG. 2 illustrates in section the internals of a typical check valve 14.
- a valve body 20 includes an inlet 22 and an outlet 24 which are aligned about a flow axis 26.
- a ring valve seat 28 is provided at the interior end of the inlet 22 for interacting with a closure member 30 in one of two modes.
- the closure member 30 When the valve is open for flow in the permitted flow direction, the closure member 30 must be spaced away from the seat 28, thereby permitting full flow through the valve. In the event a reverse flow begins through the valve, the closure member 30 must seal against the valve seat 28 to prevent reverse flow through the inlet 22.
- the closure member 30 includes a disk portion 32 adapted for sealing engagement with the seat 28.
- the disk 32 is carried by swing arm 34 which is pivoted at 36 to a yoke 38.
- the yoke is rigidly supported at the lower portion of valve bonnet 40.
- the arm 34 swings upward until the land surface 42 thereof contacts the valve housing interior at the convex juncture 44 of the bonnet 40 and body portion 20.
- the disk 32 thus has an arc path of motion indicated at 46 between a fully closed position and the fully open position shown in phantom.
- a pair of ultrasonic transmitters and receivers are attached to the exterior of the valve body as part of the verification procedure to be more fully described below.
- a first transmitter/receiver pair 50 is positioned adjacent disk 32 when the disk 32 is in the fully closed position ( Figures 1 and 2).
- the wave transmitted from the transducer 50 is in a direction generally transverse to the permitted flow direction through the inlet 22.
- a second transducer pair 52 is attached to the valve exterior and oriented so that the transmitted wave is generally parallel to the path of motion 46 of the disk 32, in a direction perpendicular to the transmitted wave of the first transducer 50.
- the second transmitter is located in the concave portion of the juncture 44, which coincides with the closest surface of the valve relative to the fully open position of the disk 32.
- the transducers are of a type commonly available, in which the transmitter and receiver are embodied in a single housing but this is not necessary.
- Suitable transducers include a 2.25 MHz dual contact transducer and 45 degree angle beam transducer with Lucite wedge connected to an ultrasonic pulser receiver model EPOCH-2000 compact field unit available from the Parametrics Company of Boston, Massachusetts.
- the valve must be filled with a liquid, preferably water, that is a satisfactory medium for transmitting sound waves at typical ultrasonic frequencies.
- the liquid may in many situations be the process liquid available in line 12, or a separate, auxiliary test line with water (not shown) can be utilized during the verification procedure.
- the procedure requires that the person performing the test be able to apply actuating pressure sufficient to selectively move the disk 32 between the full open and full closed position, preferably with the ability to maintain the disk stationary in an intermediate position.
- This control can be provided by flow control valve 18, or a similar device utilized in connection with an auxiliary test line.
- the first transducer 50 is located at a stationary position as shown in Figure 1 on the near wall 54 (the portion that is above the plane of the paper and thus is not shown in Figure 2).
- the second transducer 52 need not be present.
- verification is made that the disk 32 is freely movable between a closed position adjacent the valve seat 28 and an open position spaced away from the valve seat. It should be understood that this verification is only a gross indicator that the arm is free to swing through at least most of the path 46. The verification does not necessarily show that the valve closure member is operable between the fully closed and fully open limits of the path 46.
- Figure 3 shows a signal trace 56, generated by the first transducer 50 in accordance with the first embodiment.
- the vertical axis 58 corresponds to reflected wave amplitude and the horizontal axis 60 is the time delay between the transmittal of the wave and the receipt of the reflected wave.
- the first transducer 50 When the closure member 30 is at the valve seat 28, the first transducer 50 generates a trace 56 in which the initial reflection 62 is due to the valve near wall 54 on which the transducer is mounted.
- the peak 64 represents the wave reflected from the disk 32. Other, smaller peaks are reflections from other structures within the body and are to be ignored.
- the peak at 66 represents the wave reflected from the back wall 68 on the other side of the valve body ( Figure 2).
- the technician operating the equipment can more easily interpret the traces by having a drawing of the valve interior, but it is within the ordinary skill of ultrasound technicians to set up and operate the equipment and interpret the traces in accordance with the teachings herein.
- traces can be saved and compared from inspection to inspection, to identify discrepancies after taking into account differences in test equipment and other uncertainties. Also, a given valve type would have a characteristic trace in the open and closed conditions which may be utilized to interpret the traces for a particular valve of that type installed in the field.
- the second, stationary transducer 52 alone could be used for obtaining traces of the reflection of the disk 32 as the disk is moved between a fully opened and a fully closed position using the valve 18 or other flow control device upstream of the check valve 14.
- Figures 4a - 4f represent traces from a second transducer mounted as shown in Figure 2.
- the initial reflection 70 is visible as a thick reflection at a time delay of about one unit and the disk reflection 72a is observed at approximately 31 ⁇ 2 time units.
- the spike 72b due to reflection of the disk has moved to about 41 ⁇ 2 time units.
- the disk reflection 72a through 72f is delayed longer and longer so that, when the valve is open less than 10%, the reflected delay 72f is at approximately seven time units.
- the traces are continuously visible on the operator's oscilloscope so that the movement of the disk spike 72 would be unmistakeable.
- both transducers 50,52 are utilized.
- the first transducer 50 is positioned initially as in the first embodiment adjacent the valve seat on the valve body surface and the second transducer is positioned on the exterior surface closest to the fully open position of the disk. In this embodiment, however, the first transducer 50 is moved along the body parallel to the arc of path 46 of disk 32 in increments corresponding to incremental positions of the disk 32 along path 46. The incremental positions of the disk 32 are controlled by the valve 18.
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- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Remote Sensing (AREA)
- Geology (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geophysics (AREA)
- Examining Or Testing Airtightness (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
- Length Measuring Devices Characterised By Use Of Acoustic Means (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Description
- The present invention pertains to valve inspection, and more particularly, to an in-line inspection technique that provides a simple, non-intrusive verification of check valve operability without valve disassembly.
- Conventionally, in process industries such as power plants and the like, the operability of check valves is verified during planned outages, by disassembling the valve, inspecting the valve components, and then reassembling the valve. Particularly in nuclear power plants, this conventional procedure has many disadvantages. The major disadvantage is that the valve to be inspected is itself often radioactive, or it contains residues of radioactive fluid. The typical time required for conventional verification is on the order of several hours, during which the maintenance worker may be exposed to, or must be protected from, radiation. In addition, there exists some risk that the valve will not be correctly reassembled, which could adversely affect valve performance.
- Thus, the need exists for a reliable, non-intrusive, in-line check valve inspection technique for verifying valve operability.
- The present invention satisfies this need in accordance with a method in which one or more ultrasonic transducers are positioned on the valve body, to generate output traces that can confirm whether the closure member in the valve can be caused to move as expected.
- More particularly, the invention includes the steps defined in independent claim 1 or
independent claim 2. - The invention is especially well-suited for verifying the range of motion of the closure member on check valves, which normally do not include position indicators. In a swing-type check valve, two transmitters and associated receivers are preferably used, oriented at right angles to each other. One is positioned next to the valve seat, transverse to the flow direction, and the other is positioned on the valve surface closest to the fully open position of the closure member, facing the valve seat.
- Once an ultrasound technician has been trained to use the technique of the present invention, only about one-half hour is required to verify operation of a typical check valve. Also, since the valve is not disassembled, the maintenance and operability uncertainty associated with proper valve reassembly is eliminated.
- It has previously been known in French Patent FR-A-2478 255, disclosing the features defined in the preambles of
claims 1 and 2, to monitor as opposed to dispose a valve with an ultrasonic transmitter and receiver permanently mounted in a positively operated valve movable member's path at a given location in the valve housing. - The preferred embodiments and the best mode for carrying out the invention will be described below with reference to the accompanying drawings, in which:
- Figure 1 is a schematic diagram of a portion of a piping system containing a valve to be inspected;
- Figure 2 is a side view, in section, of a swing check valve and associated transducers for verifying operability.
- Figure 3a and 3b are reproductions of output traces from a first transducer located in accordance with one embodiment which does not use the method according to the invention, for the closure member in the closed and fully open positions, respectively;
- Figures 4a through 4f are reproductions of output traces from a second transducer located in accordance with another embodiment which does not use the method according to the invention, for the closure member in a range of positions between fully open and fully closed.
- Figure 1 schematically illustrates a portion of a
process 10 including afluid line 12 in which are located acheck valve 14, the operation of which is to be verified, apump 16 and acontrol valve 18. - Figure 2 illustrates in section the internals of a
typical check valve 14. Avalve body 20 includes aninlet 22 and anoutlet 24 which are aligned about aflow axis 26. At the interior end of the inlet 22 aring valve seat 28 is provided for interacting with aclosure member 30 in one of two modes. When the valve is open for flow in the permitted flow direction, theclosure member 30 must be spaced away from theseat 28, thereby permitting full flow through the valve. In the event a reverse flow begins through the valve, theclosure member 30 must seal against thevalve seat 28 to prevent reverse flow through theinlet 22. - The
closure member 30 includes adisk portion 32 adapted for sealing engagement with theseat 28. Thedisk 32 is carried byswing arm 34 which is pivoted at 36 to ayoke 38. The yoke is rigidly supported at the lower portion ofvalve bonnet 40. When flow in the permitted direction is initiated, thearm 34 swings upward until theland surface 42 thereof contacts the valve housing interior at theconvex juncture 44 of thebonnet 40 andbody portion 20. Thedisk 32 thus has an arc path of motion indicated at 46 between a fully closed position and the fully open position shown in phantom. - One of the causes of check valve misoperation is the sudden, high pressure initiation of flow in the permitted direction through the valve. The force with which the
closure member 30 swings away and contacts theconvex surface 44 is so great that thearm 34 orpivot 36 are bent or otherwise damaged with theclosure member 30 sticking in the upward position or having only limited freedom of movement. It is this type of anomaly which the present invention is intended to identify. - According to Figures 1 and 2, at least a pair of ultrasonic transmitters and receivers are attached to the exterior of the valve body as part of the verification procedure to be more fully described below. In one embodiment, a first transmitter/
receiver pair 50 is positionedadjacent disk 32 when thedisk 32 is in the fully closed position (Figures 1 and 2). The wave transmitted from thetransducer 50 is in a direction generally transverse to the permitted flow direction through theinlet 22. Asecond transducer pair 52 is attached to the valve exterior and oriented so that the transmitted wave is generally parallel to the path ofmotion 46 of thedisk 32, in a direction perpendicular to the transmitted wave of thefirst transducer 50. In the illustrated embodiment, the second transmitter is located in the concave portion of thejuncture 44, which coincides with the closest surface of the valve relative to the fully open position of thedisk 32. - Preferably, the transducers are of a type commonly available, in which the transmitter and receiver are embodied in a single housing but this is not necessary. Suitable transducers include a 2.25 MHz dual contact transducer and 45 degree angle beam transducer with Lucite wedge connected to an ultrasonic pulser receiver model EPOCH-2000 compact field unit available from the Parametrics Company of Boston, Massachusetts.
- It should be appreciated that before the transducer can be attached to the valve exterior, any insulation or other obstructions must be removed from the exterior surface of the valve. The transducers must be in direct contact with the valve body to ensure proper transmission of sound waves through the valve. For similar reasons, the valve must be filled with a liquid, preferably water, that is a satisfactory medium for transmitting sound waves at typical ultrasonic frequencies. The liquid may in many situations be the process liquid available in
line 12, or a separate, auxiliary test line with water (not shown) can be utilized during the verification procedure. The procedure requires that the person performing the test be able to apply actuating pressure sufficient to selectively move thedisk 32 between the full open and full closed position, preferably with the ability to maintain the disk stationary in an intermediate position. This control can be provided byflow control valve 18, or a similar device utilized in connection with an auxiliary test line. - In a first embodiment which does not use the method according to the invention, the
first transducer 50 is located at a stationary position as shown in Figure 1 on the near wall 54 (the portion that is above the plane of the paper and thus is not shown in Figure 2). Thesecond transducer 52 need not be present. With the first embodiment, verification is made that thedisk 32 is freely movable between a closed position adjacent thevalve seat 28 and an open position spaced away from the valve seat. It should be understood that this verification is only a gross indicator that the arm is free to swing through at least most of thepath 46. The verification does not necessarily show that the valve closure member is operable between the fully closed and fully open limits of thepath 46. - Figure 3 shows a
signal trace 56, generated by thefirst transducer 50 in accordance with the first embodiment. Thevertical axis 58 corresponds to reflected wave amplitude and thehorizontal axis 60 is the time delay between the transmittal of the wave and the receipt of the reflected wave. When theclosure member 30 is at thevalve seat 28, thefirst transducer 50 generates atrace 56 in which theinitial reflection 62 is due to the valve nearwall 54 on which the transducer is mounted. Thepeak 64 represents the wave reflected from thedisk 32. Other, smaller peaks are reflections from other structures within the body and are to be ignored. The peak at 66 represents the wave reflected from theback wall 68 on the other side of the valve body (Figure 2). The technician operating the equipment can more easily interpret the traces by having a drawing of the valve interior, but it is within the ordinary skill of ultrasound technicians to set up and operate the equipment and interpret the traces in accordance with the teachings herein. - In Figure 3b, it may be seen that the peak 64a associated with the
disk 32 in Figure 3a is absent, indicating that the disk moved a substantial distance along thepath 46 and is spaced a significant distance away from thevalve seat 28. The technician can observe the transition between the conditions illustrated in Figures 3a and 3b by controlling the flow rate through thevalve 14 in small increments between zero and the flow rate for which the valve was designed to open fully. - If a particular valve is tested annually or on a regular schedule, the traces can be saved and compared from inspection to inspection, to identify discrepancies after taking into account differences in test equipment and other uncertainties. Also, a given valve type would have a characteristic trace in the open and closed conditions which may be utilized to interpret the traces for a particular valve of that type installed in the field.
- In a second embodiment, which does not use the method according to the invention, the second,
stationary transducer 52 alone could be used for obtaining traces of the reflection of thedisk 32 as the disk is moved between a fully opened and a fully closed position using thevalve 18 or other flow control device upstream of thecheck valve 14. Figures 4a - 4f represent traces from a second transducer mounted as shown in Figure 2. - In Figure 4a the
initial reflection 70 is visible as a thick reflection at a time delay of about one unit and the disk reflection 72a is observed at approximately 3½ time units. With the valve in the 90% open position as shown in Figure 4b, thespike 72b due to reflection of the disk has moved to about 4½ time units. Similarly, as the disk is moved from the fully open to the fully closed position (Figures 4a - f), the disk reflection 72a through 72f is delayed longer and longer so that, when the valve is open less than 10%, the reflected delay 72f is at approximately seven time units. As mentioned above, the traces are continuously visible on the operator's oscilloscope so that the movement of the disk spike 72 would be unmistakeable. - In a third embodiment which uses the method according to the invention, both
transducers first transducer 50 is positioned initially as in the first embodiment adjacent the valve seat on the valve body surface and the second transducer is positioned on the exterior surface closest to the fully open position of the disk. In this embodiment, however, thefirst transducer 50 is moved along the body parallel to the arc ofpath 46 ofdisk 32 in increments corresponding to incremental positions of thedisk 32 alongpath 46. The incremental positions of thedisk 32 are controlled by thevalve 18. - By correlating the trace between the first and the second transducers in this embodiment, a more complete and reliable analysis can be made of the limit positions of the disk resulting from the maximum and minimum flow rates produced through the valve by means of the
pump 16 andcontrol valve 18. The operator can thus more easily distinguish between an operable valve and defective valve in which the disk is free to move but with only limited movement. Also, since it is important that thecheck valve disk 32 does not "flutter", it is desirable that it has only two modes of operation, i.e., fully closed or fully open. By using the present invention, it may be determined with reasonable accuracy what flow rate will move the disk into the fully opened position. - Although the present invention as described above cannot unequivocally verify that the check valve will not experience small leaks when a high back pressure is applied from the
outlet 24 to theinlet 22, it will satisfactorily identify problems which would lead to a significant backflow. It should also be understood that other combinations of stationary and movable transducers are also within the scope of the invention.
Claims (2)
- A method of inspecting the operability of a valve (14) of the type having a body portion (20) including an inlet (22) and an outlet (24), a bonnet portion (40), a seat (28) surrounding the inner end of the inlet (22) and a closure member (30) movable on a path (46) in the body portion (20) between a closed position against the seat (28) and an open position spaced from the seat (28),
said method comprising the steps of:
positioning and aiming an ultrasonic transmitter (50) on the body portion (20) oriented so that the transmitted ultrasonic signal intercepts the path of the closure member (30) at least in one location;
positioning and aiming an ultrasonic receiver (50) on the body portion (20) oriented to detect ultrasonic signals from said at least one location along said path;
filling the body portion (20) with fluid capable of transmitting ultrasonic waves;
inducing the closure member (30) to move along the path (46);
operating the transmitter (50) and the receiver (50) to generate an output signal trace commensurate with the magnitude of the ultrasonic wave reflected from the closure member (30) at said at least one location;
characterized in that:
the step of inducing the closure member (30) to move along the path (46) is accomplished by applying flow pressure and includes the steps of:
holding the closure member (30) in the closed position for a preselected duration;
moving the closure member (30) to an intermediate position and holding this position for a preselected duration; and
moving the closure member (30) to the full open position and holding this position for a preselected duration;;
the steps of positioning the transmitter (50) and the receiver (50) include the steps of:
temporarily positioning the transmitter (50) and the receiver (50) on the body portion (20); and,
moving the transmitter (50) and the receiver (50), each time the closure member (30) is moved along the path, along the body portion surface closest to the closure member (30) parallel to the arc of said path (46) in increments corresponding to incremental positions of the closure member along the path (46). - A method of inspecting the operability of a check valve (14) of the type having a body portion (20) including an inlet (22) and an outlet (24), a bonnet portion (40), a seat (28) surrounding the inner end of the inlet (22) and a closure member (30) movable on a path (46) in the body portion (20) between a closed position against the seat (28) and an open position spaced from the seat (28),
said method comprising the steps of:
positioning and aiming at least one ultrasonic transmitter (50,52) on the body portion (20) oriented so that the transmitted ultrasonic signal intercepts the path of the closure member (30) at least at one location;
positioning and aiming at least one ultrasonic receiver (50,52) on the body portion (20) oriented to detect ultrasonic signals from said at least one location along said path;
filling the body portion (20) with fluid capable of transmitting ultrasonic waves;
inducing the closure member (30) to move along the path;
operating the transmitter (50,52) and the receiver (50,52) to generate an output signal trace commensurate with the magnitude of the ultrasonic wave reflected from the closure member (30) at said at least one location;
characterized in that:
the step of inducing the closure member (30) to move along the path (46) is accomplished by use of a flow control valve (18);
the steps of positioning the transmitter (50,52) and the receiver (50,52) include the steps of:
temporarily positioning two transmitters (and its associated receivers) on the body portion at substantially right angles to each other;
moving one transmitter (50) and its associated receiver (50), each time the closure member (30) is moved along the path, along the body portion surface closest to the closure member (30) parallel to the arc of said path (46) in increments corresponding to incremental positions of the closure member along the path (46); and
maintaining the other transmitter (52) and its associated receiver (52) stationary;
the step of operating the transmitter (50,52) and the receiver (50,52) includes the steps of:
generating a first output trace for said one transmitter (50) and its associated receiver, that is calibrated to show the reflected pulses from the walls of the body portion and from the closure member (30); and
generating a second output trace for said other transmitter (52) and its associated receiver (52) that is calibrated to show the time delay in the receipt of the portion of the wave reflected from the closure member (30) as the closure member (30) is moved along said path (46).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US2752787A | 1987-03-18 | 1987-03-18 | |
US27527 | 1987-03-18 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0282774A2 EP0282774A2 (en) | 1988-09-21 |
EP0282774A3 EP0282774A3 (en) | 1990-02-28 |
EP0282774B1 true EP0282774B1 (en) | 1994-01-05 |
Family
ID=21838248
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP88102656A Expired - Lifetime EP0282774B1 (en) | 1987-03-18 | 1988-02-24 | Ultrasonic check valve inspection |
Country Status (5)
Country | Link |
---|---|
US (1) | US4920802A (en) |
EP (1) | EP0282774B1 (en) |
JP (1) | JPS63314438A (en) |
KR (1) | KR920002851B1 (en) |
DE (1) | DE3886792T2 (en) |
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GB1525720A (en) * | 1975-12-20 | 1978-09-20 | Univ Cardiff | Distance measuring apparatus |
FR2478255A1 (en) * | 1980-03-11 | 1981-09-18 | Electricite De France | Ultrasonic detector for sensing power station valve closure - employs piezoelectric transducer to sense position of metallic part on valve head |
US4543649A (en) * | 1983-10-17 | 1985-09-24 | Teknar, Inc. | System for ultrasonically detecting the relative position of a moveable device |
US4678621A (en) * | 1984-03-29 | 1987-07-07 | Combustion Engineering, Inc. | Method and means for monitoring the continuity of a fluid-filled network of conduits and valves |
-
1988
- 1988-02-24 EP EP88102656A patent/EP0282774B1/en not_active Expired - Lifetime
- 1988-02-24 DE DE3886792T patent/DE3886792T2/en not_active Expired - Fee Related
- 1988-03-18 KR KR1019880002850A patent/KR920002851B1/en not_active IP Right Cessation
- 1988-03-18 JP JP63063717A patent/JPS63314438A/en active Granted
- 1988-08-05 US US07/229,788 patent/US4920802A/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
KR920002851B1 (en) | 1992-04-06 |
JPS63314438A (en) | 1988-12-22 |
US4920802A (en) | 1990-05-01 |
KR880011580A (en) | 1988-10-29 |
JPH0563738B2 (en) | 1993-09-13 |
DE3886792T2 (en) | 1994-06-16 |
DE3886792D1 (en) | 1994-02-17 |
EP0282774A3 (en) | 1990-02-28 |
EP0282774A2 (en) | 1988-09-21 |
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